JPH1151513A - Structure of main valve of rotary channel switch valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the occurrence of problems with the strength of a multipolar magnet, or the stability of size and the sliding of a valve body, by constituting the multipolar magnet of the plastic magnet in which magnetic powders is kneaded, and by forming the valve body integrally with the multipolar magnet through multiple molding. SOLUTION: A multipolar magnet 71 is constituted of a plastic magnet, and a main valve body 3 is formed integrally with the multipolar magnet 71 through multiple molding, so that the multipolar magnet 71 and the main valve body 3 can be constituted of heterogeneous ingredients. Thereby, the material selection of the main valve body 3 becomes wide, and a resin ingredient which is excellent in moldability, sliding properties, and fluid resistance can be used. Further, the flatness of the main valve seat plate 5 and the sliding sealed surface can be set at high accuracy. Moreover, since the multipolar magnet 71 is hard to cause defect and can obtain sufficient strength while being lightweight, the lightness in weight of a rotary passage switch valve and the improvement in the performance accompanied by the improvement of the rotation efficiency of the main valve body 3 can be promoted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary type flow switching valve, and more particularly to a four-way valve and a three-way valve used in a heat pump system.

[0002]

2. Description of the Related Art As a rotary flow path switching valve used as a four-way valve or a three-way valve, a cylindrical valve housing, a valve body rotatably provided in the valve housing, and fixed to the valve housing. A low-pressure port connected to the low-pressure pipe, a high-pressure port connected to the high-pressure pipe, and
A valve seat plate having at least one switching port, a multipolar magnet attached to the valve body, an electromagnetic solenoid attached to the valve housing, and a magnetic pole member attached to the valve housing and magnetized by the electromagnetic solenoid. An electromagnetic actuator that rotationally drives the valve body by the magnetic action of the multi-pole magnet and the magnetic pole member, wherein the valve body contacts the valve seat plate at one end surface of the valve body. There is known a rotary flow path switching valve configured to selectively connect the switching port to one of the low-pressure port and the high-pressure port by rotational displacement.

A multi-pole magnet made of sintered metal is attached to a valve body with a multi-pole magnet in the rotary type flow path switching valve as described above by bonding with an adhesive, ultrasonic welding, and mechanical coupling. There are a structure in which the valve is integrally mounted, and a structure in which the entire valve is molded with a plastic magnet.

[0004]

In the case where a metal multi-pole magnet formed by sintering is integrally attached to a valve body, the end of the multi-pole magnet is broken due to a hook or the like due to the material of the multi-pole magnet. There is a drawback that it is easy to handle, has a problem in strength, and is difficult to handle. In addition, the metal multi-pole magnet formed by sintering has a large weight and requires a metal yoke separately, which causes an increase in the weight of the entire rotary type flow path switching valve.

[0005] In the case where the whole valve is formed of a plastic magnet, there is no problem as in the case of a sintered multi-pole metal multipole magnet.
Since the fluidity is poor, there is a problem that the moldability is poor, and molding defects such as sink marks and voids are likely to occur. In addition, if the entire valve is made of a plastic magnet, it is difficult to set the flatness of the sealing surface where the valve body slides on the valve seat plate with high precision due to poor moldability. Since it is difficult to provide flexibility, there is a problem in the sealing and sliding properties of the valve element.

The present invention has been made in view of the above-mentioned problems, and causes a problem in strength of a multi-pole magnet and dimensional stability of resin molding of a valve body (flatness of a sealing surface). It is an object of the present invention to provide a main valve structure of a rotary type flow path switching valve which is improved so as not to cause a problem in slidability.

[0007]

In order to achieve the above-mentioned object, a main valve structure of a rotary flow passage switching valve according to the present invention has a cylindrical valve housing and a rotary housing. A valve seat that has a valve body that is displaceably provided, a low-pressure port fixed to the valve housing and connected to a low-pressure pipe, a high-pressure port connected to a high-pressure pipe, and at least one switching port And a multi-pole magnet attached to the valve body, an electromagnetic solenoid attached to the valve housing, and a magnetic pole member attached to the valve housing and magnetized by the electromagnetic solenoid, wherein the multi-pole magnet and the magnetic pole An electromagnetic actuator that rotationally drives the valve body by magnetic action with a member, wherein the valve body contacts the valve seat plate at one end surface of the valve body. In a rotary flow path switching valve configured to selectively connect and connect the switching port to one of the low-pressure side port and the high-pressure side port by rotational displacement, the multi-pole magnet is formed of a plastic material. The valve body and the multi-pole magnet are formed by plastic molding and are integrally formed by multi-molding.

According to a second aspect of the present invention, there is provided a main valve structure for a rotary flow path switching valve, wherein the plastic magnet has a cavity formed in an inner portion of a surface facing the magnetic pole member.

According to the main valve structure of the rotary flow path switching valve according to the first aspect of the present invention, the multi-pole magnet is formed of a plastic magnet, and the valve body and the multi-pole magnet are integrally formed by multiple molding. ing. Thereby, the plastic magnet and the valve body constituting the multi-pole magnet can be made of different materials, so that the metal yoke becomes unnecessary and the weight can be reduced.

[0010] According to the main valve structure of the rotary flow path switching valve according to the second aspect of the present invention, the plastic magnet is formed with a cavity inside the surface facing the magnetic pole member. Material and weight of the main valve are reduced.

[0011]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIGS. 1 to 7 show an embodiment of a main valve structure of a rotary type flow switching valve according to the present invention.
The rotary type flow switching valve includes a cylindrical valve housing 1,
A main valve body 3 provided in the valve housing 1 so as to be rotationally displaceable and movable in the rotation axis direction, a valve seat plate 5 fixed to the bottom of the valve housing 1, and a pilot provided in the main valve body 3 It has a valve 9 and an electromagnetic solenoid 11 mounted on the top of the valve housing 1.

FIGS. 5 and 6 show the rotary type flow switching valve.
As shown in FIG. 2, a low-pressure side port 15 connected to a low-pressure side pipe 13 from the suction side of the compressor P in the heat pump system is configured as a four-way valve 100 used in a heat pump system. A high-pressure port 19 to which a high-pressure pipe 17 from the discharge side of the compressor P is connected, and an evaporator (indoor heat exchanger)
It has a first switching port 23 to which the piping 21 of E is connected, and a second switching port 27 to which piping 25 of the condenser (outdoor heat exchanger) C is connected.

The main valve body 3 is, as shown in FIG.
A center pin hole 29 provided at the bottom is fitted to a center pin 31 fixed to the valve seat plate 5, and the guide housing 4, which is formed to protrude in a tongue-like shape at an upper portion, forms a valve housing 1.
Are fitted movably in the axial direction to a main valve body guiding cylindrical portion 6 provided concentrically with the large-diameter cylindrical portion 2, and these fitting guides allow the first rotation position around its own central axis. Between the ascending position and the descending position in the axial direction.

The guide portion 4 is formed on the side opposite to the high-pressure side communication groove 37 which will be described later. Is suppressed.

In the lowered position, the main valve body 3 is in contact with the valve seat plate 5 at the bottom surface (the end surface opposite to the pressure chamber 41) 33, and the bottom portion thereof has independent low-pressure side communication grooves. 3
5 and a high-pressure side communication groove 37.

In the first rotational position, the main valve body 3 connects the low pressure side port 15 and the first switching port 23 through the low pressure side communication groove 35 as shown in FIG. The high pressure side port 19 and the second switching port 27 are communicatively connected by the side communication groove 37, and in the second rotation position,
As shown in FIG. 6, the low pressure side communication groove 35 connects the low pressure side port 15 and the second switching port 27 to each other, and the high pressure side communication groove 37 connects the high pressure side port 19 and the first switching port 23. And are connected.

As a result, in the switching state in which the main valve body 3 is in the first rotational position, as shown in FIG. 5, the compressor P → the four-way valve 100 → the outdoor heat exchanger C → the throttle D → the indoor heat The refrigerant circulation path of the exchanger E → the four-way valve 100 → the compressor P is established, and the heat pump system enters the cooling mode.

On the other hand, in the switching state where the main valve body 3 is in the second rotational position, as shown in FIG. 6, the compressor P → the four-way valve 100 → the indoor heat exchanger E → the throttle D → the outdoor A refrigerant circulation path of heat exchanger C → four-way valve 100 → compressor P is established, and the heat pump system enters a heating mode.

The tip of the high pressure side pipe 17 penetrates through the high pressure side port 19 and protrudes into the high pressure side communication groove 37. The main valve body 3 is brought into contact with the inner wall surface of the high pressure side communication groove 37. The stopper also serves as a stopper that limits the range of rotational displacement of the first rotational position to the range of reciprocal rotational movement between the first rotational position and the second rotational position.

On the upper side (one end face side) of the main valve body 3, as shown in FIG. 1, a valve housing 1 and a pilot valve guide cylinder 3 formed on the upper part of the valve housing 1.
9 and the pilot valve 9 fitted to the pressure chamber 41.
Is defined. The pressure chamber 41 is provided with a bypass gap 43 between the pilot valve 9 and the main valve body 3 and a piston ring 47 fitted in a piston ring groove 45 of the main valve body 3.
Is connected to the high-pressure side communication groove 37 and the high-pressure side port 19 through a slit formed between both ends of the high-pressure side port 19, and the pressure of the high-pressure side port 19 is introduced.

The pilot valve guide cylinder 39 is a large-diameter cylinder 2
The main valve body guide cylinder 6 is provided concentrically with the main valve body guide cylinder 6.
Also, it is fitted in a valve holding hole 51 having a circular cross section formed in the center portion of the main valve body 3 so as to be movable in the axial direction, and is formed in the main valve body 3 by a needle valve portion 53 at the distal end. Valve port 5
Open and close 5.

With this structure, the pilot valve 9 is fitted movably in the axial direction to the pilot valve guide cylinder 39 on the valve housing 1 side and the valve holding hole 51 on the main valve body 3 side. It will be supported individually from both of the valve bodies 3.

As a specific shape of the stem portion 10, for example, as shown in FIGS. 7 (a) to 7 (c), the stem portion 10 has a cut surface 12 on its outer peripheral surface and has a D-shaped cross section. It has a surface shape or a polygonal cross-sectional shape, and the pilot valve guide cylinder 39 and the valve holding hole 5 are formed only by the remaining circumferential surface 14.
One that fits in 1 is conceivable.

In this case, the pressure chamber 41 and the valve port 5 are provided between the cut surface 12 of the pilot valve 9 and the valve holding hole 51.
5 is formed.

As another specific shape of the stem portion 10, as shown in FIG. 7D, an outer diameter corresponding to the inner diameter of the pilot valve guide cylindrical portion 39 and the valve holding hole 51 is provided. It may have a substantially cylindrical shape, and may fit into the pilot valve guide cylinder 39 or the valve holding hole 51 over the entire circumference of the circumferential surface 14.

In this case, as shown in FIG. 7 (e), a small diameter portion 10a is formed at the tip of the stem portion 10 near the needle valve portion 53, and the small diameter portion 10a is A through passage 10b passing through the center is provided in the radial direction of the stem portion 10, and a communication passage extending from an end face located on the pilot valve guide cylinder portion 39 side opposite to the needle valve portion 53 to the center of the through passage 10b. 10c is stem part 1
The space formed between the through-passage 10b and the communication passage 10c and the space between the small-diameter portion 10a and the valve holding hole 51 form a passage that communicates the pressure chamber 41 with the valve port 55. .

The valve port 55 is located at the center of the bottom of the valve holding hole 51, and communicates with the pressure chamber 41 via the bypass gap 43 on the one hand, and communicates with the low pressure side communication groove 35 via the communication hole 57 on the other hand.

The pilot valve 9 is urged in the valve closing direction by a spring 61 provided between the pilot valve 9 and the fixed suction element 59 of the electromagnetic solenoid 11, and the electromagnetic coil 63 of the electromagnetic solenoid 11
Is supplied to the fixed suction element 59 against the spring force of the spring 61, and the valve port 55 is opened, that is, the valve is opened.

A multi-pole magnet 71 is integrally provided above the main valve body 3. The multi-pole magnet 71 has a ring shape concentric with the main valve body 3,
Two poles and two S poles are alternately magnetized.

The multi-pole magnet 71 is composed of a plastic magnet made by kneading a magnetic material such as a magnetic ferrite powder into a plastic material such as a polyamide resin (PA) or a polypropylene resin (PP).

The main valve body 3 is a resin material having high moldability, sliding property and fluid resistance based on engineering plastics such as polyamide resin (PA), polypropylene resin (PP) and polyimide (PI). The melting point of each material of the multipole magnet 71 and the main valve body 3 is the same or different, and there is no problem in manufacturing. The main valve body 3 and the multi-pole magnet 71 are integrally formed by multiple molding. The connecting portion between the main valve body 3 and the multi-pole magnet 71 has a reversely inclined retaining shape portion 8.
Are formed.

In the multi-pole magnet 71 made of a plastic magnet, a hollow portion 72 for reducing material and reducing weight is formed in an inner portion of an outer peripheral surface portion facing a main magnetic pole member 65 described later.

The electromagnetic solenoid 11 has an electromagnetic coil 63
A staple-shaped main magnetic pole member 65 magnetically connected to one of the upper magnetic poles is fixed by a bolt 67, and is magnetically connected to the other magnetic pole below the electromagnetic coil 63 to form a main magnetic pole member. A staple-shaped auxiliary magnetic pole member 69 is fixed to the magnetic pole member 65 at a position rotated and displaced by 90 degrees around the central axis of the valve housing 1.

In the above-described electromagnetic actuator structure using the electromagnetic solenoid 11 and the multi-pole magnet 71, the main magnetic pole member 65 is magnetized to the N pole, the sub magnetic pole member 69 is magnetized to the S pole, and Alternatively, it is magnetized to the opposite polarity, and the magnetic action with the multipolar magnet 71 causes the main valve body 3 to be rotationally displaced from the first rotational position to the second rotational position or vice versa.

In the four-way valve 100 having the above-described structure, when the electromagnetic coil 63 of the electromagnetic solenoid 11 is energized in the state shown in FIG. 9 is displaced upward against the spring force of the spring 61 and is attracted to the fixed suction element 59, so that the valve port 55 is opened.

As a result, the pressure chamber 41 is connected to the low-pressure side communication groove 3.
5. The internal pressure of the pressure chamber 41 decreases from the same high pressure as the high pressure side port 19 to the same low pressure as the low pressure side port 15 by communicating with the low pressure side port 15 and the suction pressure of the compressor P. As a result, the pressure on the upper side of the main valve body 3 becomes lower than that on the lower side of the main valve body 3, and the main valve body 3 is displaced upward by the pressure difference, separated from the valve seat plate 5, and can be rotationally displaced with low resistance. become.

When the pilot valve 9 is opened, the internal pressure of the pressure chamber 41 decreases because the slit 49 of the piston ring 47 causes the pressure chamber 41 to communicate with the high-pressure side communication groove 37.
This is because the degree of communication with the high pressure side port 19 is narrowed, and this degree of communication is set to a value lower than the degree of communication between the pressure chamber 41 and the low pressure side communication groove 35 when the pilot valve 9 is opened. is there.

In the above-described state, the main valve body 3 is rotationally displaced from the first rotational position to the second rotational position by the magnetic action of the magnetic poles of the main magnetic pole member 65 and the sub magnetic pole member 69 and the multipolar magnet 71. , Or vice versa, and the heat pump cycle is switched to the cooling mode or the heating mode.

Thereafter, when the energization of the electromagnetic coil 63 is stopped, the pilot valve 9 descends due to the spring force of the spring 61 and closes. Gap 43 and piston ring 4
7, the pressure of the high-pressure side communication groove 37 and the pressure of the high-pressure side port 19 are introduced into the pressure chamber 41,
Becomes the same pressure as the pressure of the lower part of the main valve body 3, the main valve body 3 returns to the original lowered position by the spring force of the spring 61 and the weight of the main valve body 3, and comes into close contact with the valve seat plate 5.

As described above, since the multi-pole magnet 71 is formed of a plastic magnet and the main valve body 3 and the multi-pole magnet 71 are integrally formed by multiple molding, the multi-pole magnet 71 and the main valve body 3 are formed integrally. Can be made of a different material, which allows a wider range of material selection for the main valve body 3 and allows the use of a resin material having excellent moldability, slidability and fluid resistance. Can set the flatness of the sealing surface in sliding contact with the valve seat plate 5 with high accuracy.

Further, since the multi-pole magnet 71 is made of a plastic magnet, it is less susceptible to chipping and has sufficient strength as compared with a sintered metal magnet, and a sintered metal magnet is also used. In addition to the fact that the metal yoke is not required, the weight of the rotary flow passage switching valve can be reduced, and the performance of the main valve body 3 can be improved due to the improvement of the rotation efficiency. .

Further, since the multi-pole magnet 71 is formed with the cavity 72, the material can be reduced and the weight can be further reduced.

In the above embodiment, a four-way valve has been described as an example. However, the main valve structure of the rotary type flow path switching valve according to the present invention is similarly applicable to a rotary three-way valve. Needless to say.

[0045]

As will be understood from the above description, according to the main valve structure of the rotary flow path switching valve according to the first aspect of the present invention, the cylindrical valve housing and the valve housing can be rotationally displaced. A low pressure side port fixed to the valve housing and connected to the low pressure side pipe, a high pressure side port connected to the high pressure side pipe, and a valve seat plate having at least one switching port, Including a multi-pole magnet attached to the valve body, an electromagnetic solenoid attached to the valve housing and a magnetic pole member attached to the valve housing and magnetized by the electromagnetic solenoid, the multi-pole magnet and the magnetic pole member An electromagnetic actuator that drives the valve body to rotate by the magnetic action of the valve body, and the valve body comes into contact with the valve seat plate at one end face of the valve body and rotates. In the rotary flow path switching valve configured to selectively connect the switching port to one of the low pressure side port and the high pressure side port depending on the position, the multi-pole magnet is made of a plastics material by a magnetic material. The valve body and the multi-pole magnet are formed of a plastic magnet kneaded with powder, and are integrally formed by multiple molding.

Thus, the multi-pole magnet is formed of a plastic magnet, the valve body and the multi-pole magnet are integrally formed by multiple molding, and the plastic magnet and the valve body forming the multi-pole magnet are formed of different materials. The resin material with excellent moldability, slidability and fluid resistance can be used.
The flatness of the seal surface where the valve element slides on the valve seat plate can be set with high accuracy. In addition, since the multi-pole magnet is made of a plastic magnet, it is less likely to be damaged compared to a sintered metal magnet, has sufficient strength, and also has a higher strength than a sintered metal magnet. In addition, since the metal yoke is not required, the weight is light, so that the rotary type flow path switching valve can be reduced in weight and the performance can be improved due to the improvement of the rotation efficiency of the valve element. Further, the multiple molding can omit the step of joining the multipole magnet and the valve body, and can reduce the cost.

According to the main valve structure of the rotary type flow path switching valve according to the second aspect of the present invention, the plastic magnet has a cavity formed in an inner portion of a surface facing the magnetic pole member. .

As a result, the material can be reduced and the weight can be further reduced, and the performance can be improved with the improvement of the rotation efficiency of the valve element.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a main valve structure of a rotary flow path switching valve according to the present invention.

FIG. 2 is a plan view of the rotary flow path switching valve of FIG. 1;

FIG. 3 is a bottom view of the rotary flow path switching valve of FIG. 1;

FIG. 4 is a side view of the rotary flow path switching valve of FIG. 1;

5 is an explanatory diagram showing a refrigerant circuit configuration during a cooling operation when the rotary flow path switching valve of FIG. 1 is incorporated in a heat pump system.

FIG. 6 is an explanatory diagram showing a refrigerant circuit configuration during a heating operation when the rotary flow path switching valve of FIG. 1 is incorporated in a heat pump system.

7 (a) to 7 (d) are end views of the pilot valve of FIG. 1, and FIG. 7 (e) is a sectional view of the pilot valve of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve housing 3 Main valve element 5 Valve seat plate 9 Pilot valve 11 Electromagnetic solenoid 15 Low pressure side port 19 High pressure side port 23 First switching port 27 Second switching port 35 Low pressure side communication groove 37 High pressure side communication groove 41 Pressure chamber 45 Piston ring groove 47 Piston ring 55 Valve port 59 Fixed suction element 63 Electromagnetic coil 65 Main magnetic pole member 69 Secondary magnetic pole member 71 Multi-pole magnet 72 Cavity

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kazuto Aihara 535 Sasai, Sayama-shi, Saitama Prefecture Inside the Sayama Works Sagami Works, Inc. (72) Inventor Noboru Nakagawa 535 Sasai, Sayama-shi, Saitama Prefecture Inside Sagami Works, Sagami Works (72) Inventor Kazushige Suzuki 535 Sasai, Sayama City, Saitama Prefecture Sagimiya Manufacturing Co., Ltd.Sayama Works (72) Inventor Mitsuo Sugita 535 Sasai City, Sayama City, Saitama Prefecture Sagamiya Manufacturing Co., Ltd.Sayama Works (72) Inventor Toshihiro Teranishi 535 Sasai, Sayama City, Saitama Prefecture Sagimiya Manufacturing Co., Ltd.Sayama Works (72) Inventor Kazuo Hirata Sayama City, Saitama Prefecture Sagimiya Manufacturing Co., Ltd.Sayama Works

Claims (2)

[Claims] 1. A cylindrical valve housing, a valve body rotatably displaced in the valve housing, a low pressure side port fixed to the valve housing and connected to a low pressure side pipe, and a high pressure side pipe connected thereto. A high-pressure side port, and a valve seat plate having at least one switching port; a multi-pole magnet attached to the valve body; an electromagnetic solenoid attached to the valve housing; and the electromagnetic solenoid attached to the valve housing. A magnetic pole member that is magnetized by the magnetic pole member, and has an electromagnetic actuator that rotationally drives the valve body by a magnetic action of the multipolar magnet and the magnetic pole member, wherein the valve body is provided on one end surface of the valve body. The switching port is selectively connected to one of the low-pressure side port and the high-pressure side port by rotational displacement. In the rotary flow path switching valve configured as described above, the multi-pole magnet is formed by a plastic magnet obtained by kneading magnetic powder into a plastic material, and the valve body and the multi-pole magnet are integrally formed by multiple molding. A main valve structure of a rotary flow path switching valve, wherein the main valve structure is formed as follows. 2. The main valve structure of a rotary flow path switching valve according to claim 1, wherein the plastic magnet has a hollow portion formed in an inner portion of a surface portion facing the magnetic pole member.